Compressor and vacuum-pump valve.



c. WAINWRIGHT. COMPRESSOR AND VACUUM PUMP VALVE APPLICATION FILED JAIL-1, 1910.

965,052. Pacented July 19, 1910.

WIT-N58859: U3 INVENTOR. M1ta .7:. W? M Q A TTORNE'Y G. WAINWRIGHT.

COMPRESSOR AND VAGUUM PUMP VALVE.

AIfPLIGATION FILED JANA. 1910.

6595255 Patented July 19,1910.

2 SHEETS-SHEET 2.

' WITNESSES.-

1N VE T OR.

. v By 7 I r A ro/m5? CHARLES WAINWRIGHT, OF ERIE, PENNSYLVANIA.

COMPRESSOR AND VACUUM-PUMP VALVE.

Specification of Letters Patent.

Patented July '11 ll, itl lltll.

' To all whom it may concern:

Be it known that I, Canaries VVAIN- WRIGHT, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Compressor and Vacuum-Pump Valves, of which the following is a specification.

' This invention relates to improvements in valves for use in vacuum pumps and air compressors for controlling the passage of air from the cylinder to the receiving chamher, the object of the invention. being to effect improvements in the construction of the valve, whereby the same is prevented from fluttering and is causedto operate quietly and easily both in opening and in closing.

The invention consists in the construction, combination and arrangement of devices hereinafter described and claimed.

In the accompanying drawiugs:--l*igurc l is a vertical sectional view of a valve constructed in accordance with this invention showing the same in place for controlling the passage of air from the cylinder to the receiving chamber of an air compressor or vacuum pump. F ig'. 2 is a detail vertical sectional view, showing a modified construction of the valve.

'F or the purpose of this specification, a portion of an air compressor or vacuum pump is shown in Figz l ot' the drawings, the cylinder in which the compressor or pump piston operates being indicated at l, the chamber which receives air from said, cylinder beingindicited at 2 and the port which establishes communication between the cylinder and the receiving chamber be ing indicated at 3. In the embodiment of my invention there is provided a circular recess 4 around and above the port 3 in which is placed a gasket 5 against which the inner or lower end of the valve cage (3 abuts the said valve-cage being here shown as cylindrical in form, and scrc'wcd as at'7 in an opening in the outer wall 8 of the chamber 2. In the inner end of the valve cage 6 is a downwardly tapered valve seat i), said valve seat communicating with the ports 3 in the sides or" the valve cage. At the inner end thereof are ports oropenings 1.0 which co-act V with the valve seat and the ports 3 to estab lish communication between the cylinder 1 and the chamber 2 when the valve hereinafter described, is opened. I

In the upper or outer end of the cylindrical valve cag arc notches 11 for there ception of the arms of a spanner to facilitate the placing of the valve cage in the threaded opening of the wall 8 or its removal therefrom or adjustn ient therein, as will be understood. I

The outer end of the cylindrical valve vcage is closed by a cylindrical "up 12 which is screwed thereon as at 13 and 'said cap having radial openings 14: extending to its perimeter for the reception at the arms of a spanner to enable said cap to, be screwed in place or removed from the valve cage. The said cap is formed on its inner side with a centrally disposed tubular sleeve 15 which extends in the valve cage to within a suitable distance of the valve seat 9. In the upper or outer end of the cap 12 is a cylindrical chamber 16 in which operates a piston 17. In one side of the tubular sleeve 15 is a passage 18 which communicates at its outer end with a valve 16 and at its inner end with i a bore of said sleeve.

A valve disk 19 of inverted truncated c0nical form is disposed inthe valve cage and is adapted to close against the valve seat 9 and to open therefrom. Said valve disk is provided with an outwardly extending stem 20 which operates in and extends through the bore of the sleeve 15, the upper or outer end of said valve steinextending into the chamber 16 and having a tapered portion 21 which is fitted in and extends through a tapered. central opening in the piston 17. The extreme upper or outer end of the valve stem is reduced diametrically and provided with screw threads on which is a nut 22, the said nut bearing on the upper or outenside oi? the piston 17 and counting with the tapercd portion ll of the valve stem to se curely and yet (.letachably fasten the said piston to the said valve stem. Hence, the piston is connected to the valve disk for simultnncous movement therewith, Thcvnlve stem is provi .lcd with aceutrally disposed passage which extends from the lower or inner end thereof for a suitable distance and is provided with a port 24- which communicates with an annular circumferential channel 27 the said port, when the valve is in closed position on the seat 9, communicating with the port at the inner end of the passage 18 and, hence, establishes connininication through the passages 18 and 23bc'twccu the cylinder 1 and the chamber 16 when the valve is closed or seated. liV hen the valve is follows: Since when opened, the iort 2-1 moves out of register with the port of the passage 18 and, hence, communication between the cylinder l and the chamber it is cut oti. it will be understood that thevalve disk it) when inclosed,

cuts oil communication between the cylinder 1 and the chamber 2 and when open establishes communication between them. The cap 12 is provided with a cover 26 which is here shown as of conical form and is secured on the cap by means of bolts 27. A spring 28 bears on the upper'or outer side of the piston ii, the upper end of the said spring being seated around a boss 29 which extends j downwardly in the upper side of the cover so. Haid cover is provided with vent openlugs 30. The said spring keeps the valve equal to or in..e. (.:ess to that within the chamber 2, the valve rises easily and quietly from its seat against the tension of the spring 28 and opens communication between the cylinder 1 and the air-receiving chamber 2, and cuts off 'connnunicatioii between the air-cushioning chamber ltiand the cylinder l so that all compressed air in the air cushioning chamber under the piston 17 is eonv guiding pro ection carried by the closm lined in said air cushioning chamber. .\s

is closed 1 the piston recedes from the valve and the pressure in the cylinder 1 becomes less than inthe chamber 2, the valve disk'closes by the action ol the spring 28, the air cushion under the piston 17 in the chamber [6 preventing rapid movement of the valve and causing the latter to quietly and noiselessly close against the seat, thus preventing fluttering and noisy or irregular movement of the valve. In etl'ect the air cushion under the piston 1.7 partially counter-vails the spring. 28 so that the 'alve 19 is balanced and the pressure of the vacuun'i pump or compressor in which the valve is employed is greatly reduced. The cover 26 ot the cap being removable therel'rom enables access to be readily had to the spring 28 so that the spring can be inspected and if defective, can be replaced without the necessity of disturbing the valve.

In the modified construction of the valve shown in Fig. 2, there is a check valve 21 at the lower end of the passage 23 and normally closed against the seat 32 by action of a.

springfit'i. The said check valve is employed when any improved Valve is used 1nan air compressor and to prevent the air pressure in the air cushioning chamber under the piston 1.7,t'rom diminishing by the leaking of air from the said chamber back into the cylinder 1 of the air compressor.

1 laving thus described the invention, What is elaimdd is:--

l. A valve to control the passage of air from the cylinder to the receiving chamber of an air compressor or vacuum pump, said valve comprising a cage having an opening at o'ne side to communicate with said receivmg chamber, and an opening at ts inner end to communicate with said cylinder and further provided at said inner end with a valve seat, a valve disk in said cage to close against said seat, and having a stem apertured means to guide the stem, a cap on'the outer end of said cage having an air chamber communicating with said cylinder through said stem and t )ertured means, when the valve is closed and into which said stem extends,a piston fast on said stem and operating in said air chamber, and a spring acting on said valve disk to normally seat the same.

:2. it valve of the character described, comprising an apertnred cage having a valve seat, a closingcap 'arried by the cage and having a channel therein, a centrally bored cap, -a valve reciprocally mounted in sai guidin pro ect1on and havm longltudinal and lateral ports, said lateral port adapted to communicate with the channel 'in the guiding projection, a compression chamber formed on the cap and into which the valve stem extends, a piston carried it vented means to close the compression chamber, and a spring interposed between the said means and the valve stem and adapted to normally hold the valve upon its seat where onthe valve, stem and operating within t e extension,

by the ports and channels are normally held in register.

In testimony whereof I attix my signature in presence of-two witnesses.

' CHARLES, l/VAINWRIGHT. Witnesses: Y

E. SHERMAN, A. Mas'rnn. 

